Hi, I have a building polygon table and from the following query i get the polygon coordinates.
select st_astext (st_geometryn(the_geom, 1)) from building_poly; Now what i need is to get the concave hull of all polygon coordinates. I tried the following query but it does not work. SELECT ST_ConcaveHull(ST_Union(select st_astext (st_geometryn(the_geom, 1)) from building_poly), 1) As convexhull; How to correct it? Cheers, Sanjeewa.
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